enable stylecheck linter

[bmoffatt]

Description of changes:

I give a lot of feedback on field naming consistency - enabling and configuring the stylecheck linter will help capture the majority of this feedback automatically

This required back-filling //nolint: stylecheck into all the places where there was an inconsistency that can't be fixed without breaking API compatibility

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #396 (2682cc2) into main (f9e86f1) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #396   +/-   ##
=======================================
  Coverage   71.63%   71.63%           
=======================================
  Files          19       19           
  Lines        1040     1040           
=======================================
  Hits          745      745           
  Misses        228      228           
  Partials       67       67           

Impacted Files	Coverage Δ
events/attributevalue.go	78.26% <ø> (ø)
events/code_commit.go	28.12% <ø> (ø)
events/s3.go	50.00% <ø> (ø)
lambda/runtime_api_client.go	73.13% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f9e86f1...2682cc2. Read the comment docs.

[iph]

beautiful linting :')